Bipartite electronic superstructures in the vortex core of Bi2Sr2CaCu2O8+δ

T. Machida (), Y. Kohsaka, K. Matsuoka, K. Iwaya, T. Hanaguri () and T. Tamegai
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T. Machida: RIKEN Center for Emergent Matter Science
Y. Kohsaka: RIKEN Center for Emergent Matter Science
K. Matsuoka: RIKEN Center for Emergent Matter Science
K. Iwaya: RIKEN Center for Emergent Matter Science
T. Hanaguri: RIKEN Center for Emergent Matter Science
T. Tamegai: The University of Tokyo, Hongo

Nature Communications, 2016, vol. 7, issue 1, 1-6

Abstract: Abstract The central issue in the physics of cuprate superconductivity is the mutual relationship among superconductivity, pseudogap and broken-spatial-symmetry states. A magnetic field B suppresses superconductivity, providing an opportunity to investigate the competition among these states. Although various B-induced electronic superstructures have been reported, their energy, spatial and momentum-space structures are unclear. Here, we show using spectroscopic-imaging scanning tunnelling microscopy on Bi2Sr2CaCu2O8+δ that there are two distinct B-induced electronic superstructures, both being localized in the vortex core but appearing at different energies. In the low-energy range where the nodal Bogoliubov quasiparticles are well-defined, we observe the so-called vortex checkerboard that we identify as the B-enhanced quasiparticle interference pattern. By contrast, in the high-energy region where the pseudogap develops, the broken-spatial-symmetry patterns that pre-exist at B=0 T is locally enhanced in the vortex core. This evidences the competition between superconductivity and the broken-spatial-symmetry state that is associated with the pseudogap.

Date: 2016
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DOI: 10.1038/ncomms11747

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